Use LUA_VERSION if set to identify LuaRocks manifest to search #319
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It is quite common to have more than one Lua VM available, and `luarocks` will typically default to one that the system has suggested as the default. This may or not be the one a developer is trying to target, especially if LuaJIT is allowable. The AX_PROG_LUA macro now has detection support for LuaJIT, and this very likely will *not* be the VM that LuaRocks defaults to looking for. With this, any previous use of AX_PROG_LUA will have set the variable LUA_VERSION, and if so `luarocks` will search for manifests matching that version. This way LuaJIT (which uses 5.1 versioning) can be queried for compatible rocks even if the system default is 5.4 or similar.
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This was referenced Nov 22, 2024
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Follow up to #313, makes the LuaRocks macro useful for projects that have chosen LuaJIT.